Hi Francesco,
I change the maximun flow rate in the Fan (The PIU Fan) and also I change the MAximun secondary AirFlow Rate of the AirTerminal:SingleDuct:PIU.
Doing that had help me to avoid getting many set point not met hours. If I leave the Maximum Flow Rate of the Fan:constant Valume as autosize, i would get many unmet load hours.
Prints below may help you!
2016-07-22 12:34 GMT-05:00 fpasserini.tn@xxxxxxxxx [EnergyPlus_Support] <EnergyPlus_Support@xxxxxxxxxxxxxxx>:
ÂI'm reading this old discussion again because I'm trying to respect G3.1.3.14, in particular: "Fans in parallel VAV fan-powered boxes shall be sized for 50% of the peak design flow rate".Â
I'm using this useful James's suggestion:I do not know of a way to automatically size the PFP fan for 50% of the maximum primary flow rate, so I run the program once using â??autosizeâ?? for primary flow rate, then check to see the autosized value, then enter 50% of that into the fan â??Maximum flow rateâ??.I used this suggestion also in the past, but now I'm facing a problem. After that I have imposed the "Maximum Secondary Air Flow Rate" of the object AirTerminal:SingleDuct:ParallelPIU:Reheat equal to 50% of the "Maximum Primary Air Flow Rate", the heating setpoint not met hours have increased a lot. It seems reasonable, because in centralized VAV systems with PFP boxes the heating demand is met by the secondary flow rate.What do you think? Any suggestion, please?Best RegardsFrancescoÂ
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Posted by: andres gmail <andresdagm@xxxxxxxxx>
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